ui/message_center/views/bounded_label_unittest.cc

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ui/message_center/views/bounded_label.h"
   6
   7 #include <limits>
   8
   9 #include "base/strings/string_util.h"
  10 #include "base/strings/utf_string_conversions.h"
  11 #include "testing/gtest/include/gtest/gtest.h"
  12 #include "ui/gfx/font_list.h"
  13 #include "ui/gfx/text_utils.h"
  14 #include "ui/views/controls/label.h"
  15
  16 namespace message_center {
  17
  18 namespace test {
  19
  20 /* Test fixture ***************************************************************/
  21
  22 class BoundedLabelTest : public testing::Test {
  23  public:
  24   BoundedLabelTest() {
  25     digit_pixels_ = gfx::GetStringWidth(base::UTF8ToUTF16("0"), font_list_);
  26     space_pixels_ = gfx::GetStringWidth(base::UTF8ToUTF16(" "), font_list_);
  27     ellipsis_pixels_ = gfx::GetStringWidth(base::UTF8ToUTF16("\xE2\x80\xA6"),
  28                                            font_list_);
  29   }
  30
  31   ~BoundedLabelTest() override {}
  32
  33   // Replaces all occurences of three periods ("...") in the specified string
  34   // with an ellipses character (UTF8 "\xE2\x80\xA6") and returns a string16
  35   // with the results. This allows test strings to be specified as ASCII const
  36   // char* strings, making tests more readable and easier to write.
  37   base::string16 ToString(const char* string) {
  38     const char kPeriods[] = "...";
  39     const char kEllipses[] = "\xE2\x80\xA6";
  40     std::string result = string;
  41     base::ReplaceSubstringsAfterOffset(&result, 0, kPeriods, kEllipses);
  42     return base::UTF8ToUTF16(result);
  43   }
  44
  45   // Converts the specified elision width to pixels. To make tests somewhat
  46   // independent of the fonts of the platform on which they're run, the elision
  47   // widths are specified as XYZ integers, with the corresponding width in
  48   // pixels being X times the width of digit characters plus Y times the width
  49   // of spaces plus Z times the width of ellipses in the default font of the
  50   // test plaform. It is assumed that all digits have the same width in that
  51   // font, that this width is greater than the width of spaces, and that the
  52   // width of 3 digits is greater than the width of ellipses.
  53   int ToPixels(int width) {
  54     return digit_pixels_ * width / 100 +
  55            space_pixels_ * (width % 100) / 10 +
  56            ellipsis_pixels_ * (width % 10);
  57   }
  58
  59   // Exercise BounderLabel::GetWrappedText() using the fixture's test label.
  60   base::string16 GetWrappedText(int width) {
  61     return label_->GetWrappedTextForTest(width, lines_);
  62   }
  63
  64   // Exercise BounderLabel::GetLinesForWidthAndLimit() using the test label.
  65   int GetLinesForWidth(int width) {
  66     label_->SetBounds(0, 0, width, font_list_.GetHeight() * lines_);
  67     return label_->GetLinesForWidthAndLimit(width, lines_);
  68   }
  69
  70  protected:
  71   // Creates a label to test with. Returns this fixture, which can be used to
  72   // test the newly created label using the exercise methods above.
  73   BoundedLabelTest& Label(base::string16 text, int lines) {
  74     lines_ = lines;
  75     label_.reset(new BoundedLabel(text, font_list_));
  76     label_->SetLineLimit(lines_);
  77     return *this;
  78   }
  79
  80  private:
  81   // The default font list, which will be used for tests.
  82   gfx::FontList font_list_;
  83   int digit_pixels_;
  84   int space_pixels_;
  85   int ellipsis_pixels_;
  86   scoped_ptr<BoundedLabel> label_;
  87   int lines_;
  88 };
  89
  90 /* Test macro *****************************************************************/
  91
  92 #define TEST_WRAP(expected, text, width, lines) \
  93   EXPECT_EQ(ToString(expected), \
  94             Label(ToString(text), lines).GetWrappedText(ToPixels(width)))
  95
  96 #define TEST_LINES(expected, text, width, lines) \
  97   EXPECT_EQ(expected, \
  98             Label(ToString(text), lines).GetLinesForWidth(ToPixels(width)))
  99
 100 /* Elision tests **************************************************************/
 101
 102 TEST_F(BoundedLabelTest, GetWrappedTextTest) {
 103   // One word per line: No ellision should be made when not necessary.
 104   TEST_WRAP("123", "123", 301, 1);
 105   TEST_WRAP("123", "123", 301, 2);
 106   TEST_WRAP("123", "123", 301, 3);
 107   TEST_WRAP("123\n456", "123 456", 301, 2);
 108   TEST_WRAP("123\n456", "123 456", 301, 3);
 109   TEST_WRAP("123\n456\n789", "123 456 789", 301, 3);
 110
 111   // One word per line: Ellisions should be made when necessary.
 112   TEST_WRAP("123...", "123 456", 301, 1);
 113   TEST_WRAP("123...", "123 456 789", 301, 1);
 114   TEST_WRAP("123\n456...", "123 456 789", 301, 2);
 115
 116   // Two words per line: No ellision should be made when not necessary.
 117   TEST_WRAP("123 456", "123 456", 621, 1);
 118   TEST_WRAP("123 456", "123 456", 621, 2);
 119   TEST_WRAP("123 456", "123 456", 621, 3);
 120   TEST_WRAP("123 456\n789 012", "123 456 789 012", 621, 2);
 121   TEST_WRAP("123 456\n789 012", "123 456 789 012", 621, 3);
 122   TEST_WRAP("123 456\n789 012\n345 678", "123 456 789 012 345 678", 621, 3);
 123
 124   // Two words per line: Ellisions should be made when necessary.
 125   TEST_WRAP("123 456...", "123 456 789 012", 621, 1);
 126   TEST_WRAP("123 456...", "123 456 789 012 345 678", 621, 1);
 127   TEST_WRAP("123 456\n789 012...", "123 456 789 012 345 678", 621, 2);
 128
 129   // Single trailing spaces: No ellipses should be added.
 130   TEST_WRAP("123", "123 ", 301, 1);
 131   TEST_WRAP("123\n456", "123 456 ", 301, 2);
 132   TEST_WRAP("123\n456\n789", "123 456 789 ", 301, 3);
 133   TEST_WRAP("123 456", "123 456 ", 611, 1);
 134   TEST_WRAP("123 456\n789 012", "123 456 789 012 ", 611, 2);
 135   TEST_WRAP("123 456\n789 012\n345 678", "123 456 789 012 345 678 ", 611, 3);
 136
 137   // Multiple trailing spaces: No ellipses should be added.
 138   TEST_WRAP("123", "123         ", 301, 1);
 139   TEST_WRAP("123\n456", "123 456         ", 301, 2);
 140   TEST_WRAP("123\n456\n789", "123 456 789         ", 301, 3);
 141   TEST_WRAP("123 456", "123 456         ", 611, 1);
 142   TEST_WRAP("123 456\n789 012", "123 456 789 012         ", 611, 2);
 143   TEST_WRAP("123 456\n789 012\n345 678",
 144             "123 456 789 012 345 678         ", 611, 3);
 145
 146   // Multiple spaces between words on the same line: Spaces should be preserved.
 147   // Test cases for single spaces between such words are included in the "Two
 148   // words per line" sections above.
 149   TEST_WRAP("123  456", "123  456", 621, 1);
 150   TEST_WRAP("123  456...", "123  456 789   012", 631, 1);
 151   TEST_WRAP("123  456\n789   012", "123  456 789   012", 631, 2);
 152   TEST_WRAP("123  456...", "123  456 789   012  345    678", 621, 1);
 153   TEST_WRAP("123  456\n789   012...", "123  456 789   012 345    678", 631, 2);
 154   TEST_WRAP("123  456\n789   012\n345    678",
 155             "123  456 789   012 345    678", 641, 3);
 156
 157   // Multiple spaces between words split across lines: Spaces should be removed
 158   // even if lines are wide enough to include those spaces. Test cases for
 159   // single spaces between such words are included in the "Two words  per line"
 160   // sections above.
 161   TEST_WRAP("123\n456", "123  456", 321, 2);
 162   TEST_WRAP("123\n456", "123         456", 391, 2);
 163   TEST_WRAP("123\n456...", "123  456  789", 321, 2);
 164   TEST_WRAP("123\n456...", "123         456         789", 391, 2);
 165   TEST_WRAP("123  456\n789  012", "123  456  789  012", 641, 2);
 166   TEST_WRAP("123  456\n789  012...", "123  456  789  012  345  678", 641, 2);
 167
 168   // Long words without spaces should be wrapped when necessary.
 169   TEST_WRAP("123\n456", "123456", 300, 9);
 170
 171   // TODO(dharcourt): Add test cases to verify that:
 172   // - Spaces before elisions are removed
 173   // - Leading spaces are preserved
 174   // - Words are split when they are longer than lines
 175   // - Words are clipped when they are longer than the last line
 176   // - No blank line are created before or after clipped word
 177   // - Spaces at the end of the text are removed
 178
 179   // TODO(dharcourt): Add test cases for:
 180   // - Empty and very large strings
 181   // - Zero, very large, and negative line limit values
 182   // - Other input boundary conditions
 183   // TODO(dharcourt): Add some randomly generated fuzz test cases.
 184 }
 185
 186 /* GetLinesTest ***************************************************************/
 187
 188 TEST_F(BoundedLabelTest, GetLinesTest) {
 189   // Zero and negative width values should yield zero lines.
 190   TEST_LINES(0, "123 456", 0, 1);
 191   TEST_LINES(0, "123 456", -1, 1);
 192   TEST_LINES(0, "123 456", -2, 1);
 193   TEST_LINES(0, "123 456", std::numeric_limits<int>::min(), 1);
 194
 195   // Small width values should yield one word per line.
 196   TEST_LINES(1, "123 456", 1, 1);
 197   TEST_LINES(2, "123 456", 1, 2);
 198   TEST_LINES(1, "123 456", 2, 1);
 199   TEST_LINES(2, "123 456", 2, 2);
 200   TEST_LINES(1, "123 456", 3, 1);
 201   TEST_LINES(2, "123 456", 3, 2);
 202
 203   // Large width values should yield all words on one line.
 204   TEST_LINES(1, "123 456", 610, 1);
 205   TEST_LINES(1, "123 456", std::numeric_limits<int>::max(), 1);
 206 }
 207
 208 /* Other tests ****************************************************************/
 209
 210 // TODO(dharcourt): Add test cases to verify that:
 211 // - SetMaxLines() affects the return values of some methods but not others.
 212 // - Bound changes affects GetPreferredLines(), GetTextSize(), and
 213 //   GetWrappedText() return values.
 214 // - GetTextFlags are as expected.
 215
 216 }  // namespace test
 217
 218 }  // namespace message_center